The invention relates to apparatus for controlling equipment for treating rubber and or plastic strand-form products produced by an extruder and/or calender, such equipment having at least one conveyor. The apparatus has a feeler roll carried by at least one arm on a rotatable shaft and engageable with the strand-form product at the end of a conveyor or between two conveyors of the treating equipment. On one end of the shaft there is a cam disc the position of which is sensed by an inductive pick-up to produce a signal indicative of the angular position of the shaft. The shaft is rotatable to vary the position of the feeler roll, by a pneumatic servo motor actuating a rack meshing with a gear wheel fixed on the shaft. The servo motor is controlled by a control circuit which receives the position indicating signal. For positioning the feeler roll in a position for threading the equipment in starting-up, there is provided an override having a second pneumatic servo motor which actuates an arm which is rotatable on the shaft and is engageable with a bolt projecting from the gear wheel.
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